The Missouri (MO) state sales tax rate is currently 4.225%. Depending on local municipalities, the total tax rate can be as high as 9.6%.

Missouri allows all the state and local sales taxes to be remitted together at the state level. Once the seller remits sales tax to the Department of Revenue, the department will then distribute the local sales taxes to the cities, counties and districts.

Missouri charges what is called a Transactional Privilege Tax (TPT), considered a sales tax on all sellers for the privilege of engaging in business in the state of Missouri. So additional fees on a sale, such as administrative fees for a service such as auction fees, can be considered taxable.

Missouri Department of Revenue